An SEC filing indicates that Zynga is reading its IPO for the tech oriented stock exchange NASDAQ. The company’s ticker symbol will be “ZNGA” and it is expected that $20 billion will be raised quickly.

Zynga is the market in Facebook gaming, though EA has managed to cut into that with The Sims Social. The filing by Zynga indicates that 78 percent of the company’s revenue was generated in 2010 by CityVille, Mafia Wars and FarmVille.